The effective efficiency of PV modules under natural conditions differs significantly from efficiency data thatmay be available a priori from their data sheets. Moreover, this efficiency is not constant.The output energy of photovoltaic modules of the type mon°Crystalline, polycrystalline and amorphoussilicon, mounted at 30°to the horizontal plane was measured. In add ition, the climatic data and radiation weremeasured. A function of generated energy using intelligence computational techniques for the differentmaterials was modeled. The found functions show a common structure in the studied materials but differ onthe equation constants of the model. These results allow to estimate the energy generated on the basis of dataavailable for different types of modules under real operating conditions.
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